• Travelogue (Giacomo's Travelogue): A book that lists all the biomes you've yet to find in that world. Registered as a vanilla book it seems, not sure if it can be detected somehow.
• Tech Manual (TechReborn)

Evilcraft's Origin of Darkness book should also be added imo

Draconic Evolution information tablet would be cool too.

Bestiary from ice and fire https://minecraft.curseforge.com/projects/ice-and-fire-dragons-in-a-whole-new-light

Add the Woot Guide and Blood Burned Tome (Blood Arsenal) perhaps?

First, you can change the config file to add these to your current pack
and second the Holosphere from Tetra

Edit: oops didn't realise the date, still gonna leave this here though